Reduced X2-price if you already own the full version of Rapture...?

no, I doubt there will be.  there wasn't when DimPro was introduced as part of sonar, so I don't suspect there will be a discount for rapture either.

Don't feel too bad. We're all going to pay for something we already own.

If you wait for stuff to be bundled you miss out on getting to use it.
If you've already bought it, you have had the use of what you paid for. 
That's no reason for Cakewalk to give a discount to someone who already has that particular software. You're already getting a discount for owning the the current version of SONAR.
We want Cakewalk to have enough revenue to keep improving SONAR.

Long term users have probably worked out the sales , discount, upgrade cycles and can maximize their software purchases. But we all get stung occasionally when something we already have gets bundled with the new version at no extra cost.